[Tile-serving] [openstreetmap/osm2pgsql] Tile Expiry Performance (#946)

[Sarah Hoffmann]

> However, the influence on the total memory consumption is limited.

I'm not convinced you can prove that by looking at the  "Maximum resident set size". The "Maximum resident set size" is dominated by the memory-mapped flatnode file. It is not a really helpful measurement here because how much of it is resident is mostly determined by your available RAM size. 

However, @intergalacticdata's statement "While expiring tiles, [the memory usage] ballooned to >50GB before being killed." is similarly unhelpful. Newer versions of osm2pgsql always balloon like this because of the memory-mapped flatnode file. It is not an indicator of a memory leak, nor reason for being OOM-killed.

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